AP Stats Sampling Methods and Design 2

Question 1

A researcher divides a city into neighborhoods and randomly selects 5 neighborhoods, then surveys every household in those neighborhoods. This is an example of:

Accepted Answer

Cluster sampling

Answer

Cluster sampling selects entire groups (clusters) rather than individuals, then includes all members of selected clusters.

Question 2

Which of the following is the primary advantage of stratified random sampling over simple random sampling?

Accepted Answer

It ensures representation from every subgroup

Answer

Stratified sampling guarantees representation from each defined stratum, reducing variability and ensuring subgroups are not accidentally underrepresented.

Question 3

A teacher numbers students 1–30 and selects every 5th student starting from student #3. Which students are selected?

Accepted Answer

3, 8, 13, 18, 23, 28

Answer

Starting at 3 and selecting every 5th: 3, 8, 13, 18, 23, 28 — this is systematic sampling.

Question 4

Undercoverage bias occurs when:

Accepted Answer

Some members of the population have no chance of being selected

Answer

Undercoverage happens when parts of the population are excluded from the sampling frame, making those groups unable to be selected.

Question 5

A polling company calls landline phone numbers to survey voters. Which bias is most likely introduced?

Accepted Answer

Undercoverage bias

Answer

Using only landlines excludes people who only have cell phones, creating undercoverage of that demographic.

AP Practice Test

AP Practice Test

AP Stats Sampling Methods and Design 2